<template>
  <div>
    <el-switch v-model="draggable" active-text="开启拖拽" inactive-text="关闭拖拽"></el-switch>
    <el-button v-if="draggable" @click="batchSave">批量保存</el-button>
    <el-button type="danger" @click="batchDelete">批量删除</el-button>
    <br/>
    <el-input placeholder="输入关键字进行过滤" v-model="filterText" style="width:30%;"></el-input>
    <el-tree
      :data="menus"
      node-key="catId"
      show-checkbox
      :props="defaultProps"
      :expand-on-click-node="false"
      :default-expanded-keys="expandedKey"
      :draggable="draggable"
      :allow-drop="allowDrop"
      @node-drop="handleDrop"
      ref="menuTree"
      :filter-node-method="filterNode"
      :highlight-current="true"
    >
      <span class="custom-tree-node" slot-scope="{ node, data }">
        <span>{{ node.label }}</span>
        <span>
          <el-button v-if="node.level <= 2" type="text" size="mini" @click="() => append(data)">添加</el-button>
          <el-button
            v-if="node.childNodes.length == 0"
            type="text"
            size="mini"
            @click="() => remove(node, data)"
          >删除</el-button>
          <el-button type="text" size="mini" @click="() => edit(data)">修改</el-button>
        </span>
      </span>
    </el-tree>

    <el-dialog
      :title="title"
      :visible.sync="dialogVisible"
      width="30%"
      :close-on-click-modal="false"
    >
      <el-form :model="category">
        <el-form-item label="分类名字">
          <el-input v-model="category.name" autocomplete="off"></el-input>
        </el-form-item>
        <el-form-item label="图标">
          <el-input v-model="category.icon" autocomplete="off"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="dialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="submitData">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      filterText: "",
      pCid: [],
      draggable: false,
      updateNodes: [],
      maxLevel: 0,
      title: "",
      dialogType: "", //edit,add
      category: {
        catId: null,
        name: "",
        parentCid: 0,
        catLevel: 0,
        sort: 1,
        icon: "icon"
      },
      adddelCouunt: 0,
      dialogVisible: false,
      menus: [],
      defaultProps: {
        children: "children",
        label: "name"
      },
      expandedKey: []
    };
  },
  watch: {
    filterText(val) {
      this.$refs.menuTree.filter(val);
    }
  },
  methods: {
    //树节点过滤
    filterNode(value, data) {
      if (!value) return true;
      return data.name.indexOf(value) !== -1;
    },
    getMenus() {
      this.$http({
        url: this.$http.adornUrl("/ly/classcategory/list/tree"),
        method: "get"
      }).then(({ data }) => {
        console.log("成功获取到数据", data.data);
        this.menus = data.data;
      });
    },
    batchDelete() {
      let catIds = [];
      let checkedNodes = this.$refs.menuTree.getCheckedNodes();
      console.log("被选中的元素", checkedNodes);
      for (let i = 0; i < checkedNodes.length; i++) {
        catIds.push(checkedNodes[i].catId);
      }
      this.$confirm(`此操作将批量删除该课程[${catIds}], 是否继续?`, "提示", {
        confirmButtonText: "确定",
        cancelButtonText: "取消",
        type: "warning"
      })
        .then(() => {
          this.$http({
            url: this.$http.adornUrl("/ly/classcategory/delete"),
            method: "post",
            data: this.$http.adornData(catIds, false)
          }).then(({ data }) => {
            this.$message({
              type: "success",
              message: "菜单批量删除成功!"
            });
            this.getMenus();
          });
        })
        .catch(() => {});
    },
    batchSave() {
      this.$http({
        url: this.$http.adornUrl("/ly/classcategory/update/sort"),
        method: "post",
        data: this.$http.adornData(this.updateNodes, false)
      }).then(({ data }) => {
        this.$message({
          type: "success",
          message: "菜单修改成功!"
        });
        //刷新出新的菜单
        this.getMenus();
        //设置需要展开的菜单----------this.pCid数组没有制空
        this.expandedKey = this.pCid;
        this.updateNodes = [];
        this.maxLevel = 0;
        // this.pCid=0;
      });
    },
    handleDrop(draggingNode, dropNode, dropType, ev) {
      console.log("拖拽成功之后: ", draggingNode, dropNode, dropType);
      //2、当前节点的最新父节点id
      let pCid = 0;
      let siblings = null;
      if (dropType == "before" || dropType == "after") {
        pCid =
          dropNode.parent.data.catId == undefined
            ? 0
            : dropNode.parent.data.catId;
        siblings = dropNode.parent.childNodes;
      } else {
        pCid = dropNode.data.catId;
        siblings = dropNode.childNodes;
      }
      this.pCid.push(pCid);
      //3、当前拖拽的节点的最新顺序
      for (let i = 0; i < siblings.length; i++) {
        if (siblings[i].data.catId == draggingNode.data.catId) {
          //如果遍历的是当前正在拖拽的节点
          let catLevel = draggingNode.level;
          if (siblings[i].level != draggingNode.level) {
            //当前节点的层级发生变化
            catLevel = siblings[i].level;
            //修改字节点的层级
            this.updateChildNodeLevel(siblings[i]);
          }
          this.updateNodes.push({
            catId: siblings[i].data.catId,
            sort: i,
            parentCid: pCid,
            catLevel: catLevel
          });
        } else {
          this.updateNodes.push({ catId: siblings[i].data.catId, sort: i });
        }
      }
      //4、当前拖拽节点的最新层级
      console.log("updateNodes", this.updateNodes);
    },
    updateChildNodeLevel(node) {
      if (node.childNodes.length > 0) {
        for (let i = 0; i < node.childNodes.length; i++) {
          var cNode = node.childNodes[i].data;
          this.updateNodes.push({
            catId: cNode.catId,
            catLevel: node.childNodes[i].level
          });
          this.updateChildNodeLevel(node.childNodes[i]);
        }
      }
    },
    allowDrop(draggingNode, dropNode, type) {
      //判断被拖动的当前节点以及所在的父节点总层数不能大于3
      //1、被拖动的当前节点总层数
      console.log(
        "draggingNode",
        draggingNode,
        "dropNode",
        dropNode,
        "type",
        type
      );
      //统计当前节点的最大深度
      this.countNodeLevel(draggingNode);
      //当前节点+父节点所在的深度不大于3
      let deep = Math.abs(this.maxLevel - draggingNode.level) + 1;
      console.log("深度", deep);
      if (type == "inner") {
        return deep + dropNode.level <= 3;
      } else {
        return deep + dropNode.parent.level <= 3;
      }
    },
    countNodeLevel(node) {
      //找到所有子节点，求出最大深度
      if (node.childNodes != null && node.childNodes.length > 0) {
        for (let i = 0; i < node.childNodes.length; i++) {
          if (node.childNodes[i].level > this.maxLevel) {
            this.maxLevel = node.childNodes[i].level;
          }
          this.countNodeLevel(node.childNodes[i]);
        }
      }
    },
    edit(data) {
      console.log("要修改的数据", data);
      this.dialogType = "edit";
      this.title = "修改分类";
      this.dialogVisible = true;

      //发送请求获取最新的数据，进行回显 /info/{catId}
      this.$http({
        url: this.$http.adornUrl(`/ly/classcategory/info/${data.catId}`),
        method: "get"
      }).then(({ data }) => {
        this.category.name = data.data.name;
        this.category.catId = data.data.catId;
        this.category.icon = data.data.icon;
        this.category.parentCid = data.data.parentCid;
      });
    },
    append(data) {
      console.log("append", data);
      this.dialogType = "add";
      this.title = "添加分类";
      this.dialogVisible = true;
      this.category.parentCid = data.catId;
      this.adddelCouunt = data.catId;
      this.category.catLevel = data.catLevel * 1 + 1;

      this.category.name = "";
      this.category.catId = null;
      this.category.icon = "";
      this.category.sort = 1;
    },
    submitData() {
      if (this.dialogType == "add") {
        this.addCategory();
      }
      if (this.dialogType == "edit") {
        this.editCategory();
      }
    },
    editCategory() {
      //修改三级分类数据
      var { catId, name, icon } = this.category;
      this.$http({
        url: this.$http.adornUrl("/ly/classcategory/update"),
        method: "post",
        data: this.$http.adornData({ catId, name, icon }, false)
      }).then(({ data }) => {
        this.$message({
          type: "success",
          message: "菜单修改成功!"
        });
        //关闭对话框
        this.dialogVisible = false;
        //刷新出新的菜单
        this.getMenus();
        //设置需要展开的菜单
        this.expandedKey = [this.category.parentCid];
      });
    },
    addCategory() {
      console.log("提交的数据", this.category);
      this.$http({
        url: this.$http.adornUrl("/ly/classcategory/save"),
        method: "post",
        data: this.$http.adornData(this.category, false)
      }).then(({ data }) => {
        this.$message({
          type: "success",
          message: "保存成功!"
        });
        //关闭对话框
        this.dialogVisible = false;
        //刷新出新的菜单
        this.getMenus();
        //设置需要展开的菜单
        this.expandedKey = [this.category.parentCid];
      });
    },
    remove(node, data) {
      var ids = [data.catId];
      var parentIds = [data.parentCid];
      this.$confirm(`此操作将删除该课程[${data.name}], 是否继续?`, "提示", {
        confirmButtonText: "确定",
        cancelButtonText: "取消",
        type: "warning"
      })
        .then(() => {
          this.$http({
            url: this.$http.adornUrl("/ly/classcategory/delete"),
            method: "post",
            data: this.$http.adornData(ids, false)
          }).then(({ data }) => {
            this.$message({
              type: "success",
              message: "删除成功!"
            });
            //刷新出新的菜单
            this.getMenus();
            //设置需要展开的菜单
            this.expandedKey = [node.parent.data.catId];
          });
        })
        .catch(() => {});
      console.log("delete", node, data);
    }
  },
  created() {
    this.getMenus();
  }
};
</script>

<style>
</style>